There is no 'need' for us to eat meat dairy or eggs. Indeed these foods are increasingly linked to various human diseases and animal agriculture is an environmental disaster for the planet.
I think it makes people in the Pentagon kind of nervous to know that chemical agents and environmental factors could cause so much damage in terms of what may happen in the future.
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There are more effective ways of tackling environmental problems including global warming proliferation of plastics urban sprawl and the loss of biodiversity than by treaties top-down regulations and other approaches offered by big governments and their dependents.